Larson Davis SoundExpert LxT, Руководство пользователя

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LxT Manual Performing Measurements
6-3
Measurement Range
The measurement ranges in which the LxT meets the
standards, which depend upon the selected frequency
weighting, are shown in Table A-4, “LxT Performance
Specifications,” on page A-4. Measurements which include
levels outside this range should not be considered accurate.
Overload Indication
When input signals exceed the input range of the LxT, the
Input Overload Icon appears at the top of the display.
If a measurement is running and an overload occurs, the icon
flashes on and off for as long as the overload condition
exists, or one second minimum. When the overload has been
removed, the icon remains present (not flashing) to indicate
that an overload has occurred during the measurement. A
reset clears the icon from the display.
Under Range Indication
When input signals drop below the level that the LxT can
measure within specified tolerances, an under range
condition exists. When this happens the Under Range Icon
appears.
As long as the under range condition exists, the icon flashes.
When the measured level no longer produces an under range
condition, the icon is removed from the display.
At any time when a measured parameter is in an under range
condition, it’s numeric display appears in gray rather than
the usual black, as shown FIGURE 6-2.
FIGURE 6-2 Normal vs. Under Range Data Display
Under Range
Not Under Range